The cotton revolution (1300-1840 AD) in imperial China constituted a substantial shock to the value of women's work. Using historical gazetteers, I exploit variation in cotton textile production across 1,489 counties and establish a robust negative relationship between high-value work opportunities for women in the past and sex ratio at birth in 2000. To overcome potential endogeneity in location, I use an instrument pertaining to suitability for cotton weaving. I find evidence that premodern cotton textile production permanently changed cultural beliefs about women's worth, and that its effects have persisted beyond 1840 and endured under various political and economic regimes.

Americans spend hours every day sitting in traffic. And the roads they idle on are often rough and potholed, their exits, tunnels, guardrails, and bridges in terrible disrepair. According to transportation expert Robert Poole, this congestion and deterioration are outcomes of the way America provides its highways. Our twentieth-century model overly politicizes highway investment decisions, short-changing maintenance and often investing in projects whose costs exceed their benefits.

We discuss this book, as well as Robert's recent controversial piece in Reason, "Stop Trying to Get Workers Out of Their Cars." I challenge him on the issue of upzoning and we discuss the some of the necessary conditions for a successful implementation of mass transit. Robert argues that mass transit works best in cities with a high concentration of jobs in a central business district. Without a single concentrated area that many thousands of people want to commute to and from, a mass transit system often can't get the necessary ridership to justify its cost.